<template>
  <div>
      <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 警告 -->
        <el-alert title="只允许为第三级分类设置相关参数！" type="warning" show-icon :closable="false"></el-alert>
        <!-- 选择商品分类区 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 级联选择框 -->
                <el-cascader
                    v-model="selectedCateKeys"
                    :options="cateList"
                    :props="{ 
                        expandTrigger: 'hover',
                        value: 'cat_id',
                        label: 'cat_name',
                        children: 'children'
                         }"
                    @change="CateChanged"
                    clearable
                >
                </el-cascader>
            </el-col>
        </el-row>

        <el-tabs v-model="activeName" @tab-click="handleTabClick()">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="mini" :disabled="selectedCateKeys.length !== 3" @click="addDialogVisible = true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag
                            v-for="(tag,i) in scope.row.attr_vals"
                            :key="i"
                            closable
                            type="primary"
                            @close="hadleClose(i,scope.row)"
                            >
                                {{tag}}
                            </el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamByAttrId(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled="selectedCateKeys.length !== 3" @click="addDialogVisible = true">添加参数</el-button>
                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag
                            v-for="(tag,i) in scope.row.attr_vals"
                            :key="i"
                            closable
                            type="primary"
                            @close="hadleClose(i,scope.row)"
                            >
                                {{tag}}
                            </el-tag>
                            <!-- 输入文本框 -->
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamByAttrId(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>



    <!-- ************************************对话框************************************** -->
    <!-- 添加参数 -->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed()"
    >
      <el-form
        ref="addFormRef"
        :model="addForm"
        :rules="addFormRules"
        label-width="80px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams()">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数 -->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed()"
    >
      <el-form
        ref="editFormRef"
        :model="editForm"
        :rules="editFormRules"
        label-width="80px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams()">确 定</el-button>
      </span>
    </el-dialog>


  </div>
</template>

<script>
export default {
    name: 'Params',
    data() {
        return {
            //商品分类数组
            cateList: [],
            //级联选择框选中的商品分类
            selectedCateKeys: [],
            //被激活的页签的名称
            activeName: 'many',
            //动态参数数据
            manyTableData:[],
            //静态参数数据
            onlyTableData:[],
            //添加参数的数据
            addForm:{
                attr_name: '',
            },
            //控制添加对话框的显示与隐藏
            addDialogVisible: false,
            addFormRules:{
                attr_name:[
                    { required: true, message: "请输入参数名称", trigger: "blur" },
                ]
            },
            //修改参数的数据
            editForm:{
                attr_name: '',
            },
            //控制修改对话框的显示与隐藏
            editDialogVisible: false,
            editFormRules:{
                attr_name:[
                    { required: true, message: "请输入参数名称", trigger: "blur" },
                ]
            },


        }
    },
    created() {
        this.getCateList();
    },
    computed:{
        //当前选中的三级分类的id
        cateId(){
            return this.selectedCateKeys.length === 3 ? this.selectedCateKeys[2] : null;
        },
        //动态计算标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }else{
                return '静态属性'    
            }
        }
    },
    methods: {
        //获取所有的商品分类
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !== 200) return this.$message.error('获取商品分类数据失败');
            this.cateList = res.data;
        },
        //发起请求获取参数列表
        async getParamsData(){
            const {data:res} =
             await this.$http.get(`categories/${this.cateId}/attributes`,{params: {sel: this.activeName}})
            if(res.meta.status !== 200) return;
            //将参数值分割为数组
            res.data.forEach(item=>{
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                //控制文本框的显示与隐藏
                item.inputVisible = false;
                //文本框中输入的值
                item.inputValue = ''
            })

            if(this.activeName === 'many'){
                this.manyTableData = res.data;
            }else{
                this.onlyTableData = res.data;
            }
        },
        //级联选择框选中项发生变化，触发该函数
        CateChanged(){
            //选中的若不是三级分类，则不选中
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return 
            }
            this.getParamsData();
        },
        //tab页签点击事件的处理函数
        handleTabClick(){
            this.getParamsData();
        },
        //监听添加对话框的关闭
        addDialogClosed(){
            this.$refs.addFormRef.resetFields();
        },
        //点击添加参数
        async addParams(){
            //校验
            this.$refs.addFormRef.validate(valid=>{
                if(!valid) return;
            })

            //发起请求
            const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                attr_name: this.addForm.attr_name,
                attr_sel: this.activeName
            })
            if(res.meta.status !== 201) return this.$message.error('添加参数失败')
            this.$message.success('添加参数成功')
            this.addDialogVisible = false;
            this.getParamsData();
        },
        //点击按钮展示修改对话框
        async showEditDialog(attr_id){
            this.editDialogVisible = true;
            //查询当前参数的信息
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
            {params: {attr_sel: this.activeName}})
            if(res.meta.status !== 200) return this.$message.error('获取参数信息失败');
            this.editForm = res.data;
        },
        //监听修改对话框的关闭
        editDialogClosed(){
            this.$refs.editFormRef.resetFields();
        },
        //点击发起修改参数的请求
        async editParams(){
            //校验
            this.$refs.editFormRef.validate(valid=>{
                if(!valid) return;
            })

            const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                attr_name: this.editForm.attr_name,
                attr_sel: this.activeName
            })
            if(res.meta.status !== 200) return this.$message.error('修改参数失败')
            this.$message.success('修改参数成功')
            this.getParamsData();
            this.editDialogVisible = false;
        },
        //删除参数通过AttrId
        async removeParamByAttrId(attr_id) {
            //弹框询问用户是否删除数据
            const confirmResult = await this.$confirm(
                "此操作将永久删除该参数, 是否继续?",
                "提示",
                {
                cancelButtonText: "取消",
                confirmButtonText: "确定",
                type: "warning",
                }
            ).catch((err) => err);

            //如果用户确认删除，则返回值为'confirm',取消则是'cancel'
            if (confirmResult !== "confirm") return this.$message.info("已取消删除");
            //发起删除请求
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);
            if (res.meta.status !== 200) return this.$message.error("删除失败");
            this.$message.success("删除成功");
            this.getParamsData();
        },
        //展示newtag输入框
        showInput(row){
            row.inputVisible = true;
            //让文本框自动获得焦点
            //$nextTick作用,当页面上元素重新渲染之后，才会调用回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        //文本框失去焦点，或按下enter触发
        async handleInputConfirm(row){

            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            //如果没有return,说明数据合法，可以做后续处理
            row.attr_vals.push(row.inputValue.trim());
            this.saveAttrVals(row)
            row.inputValue = ''
            row.inputVisible = false;
        },
        //将对attr_vals的操作保存到数据库
        async saveAttrVals(row){
            //发起请求，将数据保存
            const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name: row.attr_name,
                attr_sel: this.activeName,
                attr_vals: row.attr_vals.join(' '),
            })
            if(res.meta.status !== 200) return this.$message.error('修改参数项失败')
            this.$message.success('修改参数项成功')
        },
        //删除对应的参数可选项
        hadleClose(i,row){
            row.attr_vals.splice(i,1)
            //保存
            this.saveAttrVals(row)
        }
        
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin-top: 15px;
}

.el-cascader{
    width: 280px;
}

.el-tag{
    margin: 10px;
}

.input-new-tag{
    width: 150px
}
</style>